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## https://sploitus.com/exploit?id=PACKETSTORM:161483
Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/61bec9f22a5955e076e0d5ddf6232f3f.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Trojan-Proxy.Win32.Daemonize.i   
Vulnerability: Remote Denial of Service  
Description: Daemonize.i listens on TCP port 5823, sending some junk packets to the trojan results in invalid pointer read leading to an access violation and crash.  
Type: PE32  
MD5: 61bec9f22a5955e076e0d5ddf6232f3f  
Vuln ID: MVID-2021-0102  
Dropped files:   
ASLR: False  
DEP: False  
Safe SEH: True  
Disclosure: 02/19/2021   
  
Memory Dump:  
(f0.1ba4): Access violation - code c0000005 (first/second chance not available)  
eax=00000000 ebx=00000000 ecx=ffffffff edx=00000003 esi=00000003 edi=00000003  
eip=7710ed3c esp=02a0f38c ebp=02a0f51c iopl=0 nv up ei pl nz na po nc  
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000202  
ntdll!ZwWaitForMultipleObjects+0xc:  
7710ed3c c21400 ret 14h  
  
  
0:001> !analyze -v  
*******************************************************************************  
* *  
* Exception Analysis *  
* *  
*******************************************************************************  
  
  
FAULTING_IP:   
Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea  
00402fea f2ae repne scas byte ptr es:[edi]  
  
EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff)  
ExceptionAddress: 00402fea (Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+0x00002fea)  
ExceptionCode: c0000005 (Access violation)  
ExceptionFlags: 00000000  
NumberParameters: 2  
Parameter[0]: 00000000  
Parameter[1]: 00000003  
Attempt to read from address 00000003  
  
PROCESS_NAME: Trojan-Proxy.Win32.Daemonize.i.61bec9f22a5955e076e0d5ddf6232f3f.exe  
  
ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.  
  
EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.  
  
EXCEPTION_PARAMETER1: 00000000  
  
EXCEPTION_PARAMETER2: 00000003  
  
READ_ADDRESS: 00000003   
  
FOLLOWUP_IP:   
Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea  
00402fea f2ae repne scas byte ptr es:[edi]  
  
MOD_LIST: <ANALYSIS/>  
  
NTGLOBALFLAG: 0  
  
APPLICATION_VERIFIER_FLAGS: 0  
  
FAULTING_THREAD: 00001ba4  
  
BUGCHECK_STR: APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_READ_FILL_PATTERN_ffffffff  
  
PRIMARY_PROBLEM_CLASS: NULL_CLASS_PTR_DEREFERENCE_FILL_PATTERN_ffffffff  
  
DEFAULT_BUCKET_ID: NULL_CLASS_PTR_DEREFERENCE_FILL_PATTERN_ffffffff  
  
LAST_CONTROL_TRANSFER: from 76198654 to 00402fea  
  
STACK_TEXT:   
WARNING: Stack unwind information not available. Following frames may be wrong.  
02a0ff80 76198654 02b70e50 76198630 6e5e2d5f Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+0x2fea  
02a0ff94 77104a77 02b70e50 e89bd1a1 00000000 kernel32!BaseThreadInitThunk+0x24  
02a0ffdc 77104a47 ffffffff 77129eca 00000000 ntdll!__RtlUserThreadStart+0x2f  
02a0ffec 00000000 00401937 02b70e50 00000000 ntdll!_RtlUserThreadStart+0x1b  
  
  
STACK_COMMAND: ~1s; .ecxr ; kb  
  
SYMBOL_STACK_INDEX: 0  
  
SYMBOL_NAME: Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea  
  
FOLLOWUP_NAME: MachineOwner  
  
MODULE_NAME: Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f  
  
IMAGE_NAME: Trojan-Proxy.Win32.Daemonize.i.61bec9f22a5955e076e0d5ddf6232f3f.exe  
  
DEBUG_FLR_IMAGE_TIMESTAMP: 3fdf5a56  
  
FAILURE_BUCKET_ID: NULL_CLASS_PTR_DEREFERENCE_FILL_PATTERN_ffffffff_c0000005_Trojan-Proxy.Win32.Daemonize.i.61bec9f22a5955e076e0d5ddf6232f3f.exe!Unknown  
  
BUCKET_ID: APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_READ_FILL_PATTERN_ffffffff_Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea  
  
Followup: MachineOwner  
---------  
  
0:001> .ecxr  
eax=00000000 ebx=00000000 ecx=ffffffff edx=00000003 esi=02b72538 edi=00000003  
eip=00402fea esp=02a0fcc8 ebp=02a0ff80 iopl=0 nv up ei ng nz ac pe cy  
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010297  
Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+0x2fea:  
00402fea f2ae repne scas byte ptr es:[edi]  
  
  
Exploit/PoC:  
from socket import *  
  
MALWARE_HOST="x.x.x.x"  
PORT=5823  
  
def doit():  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((MALWARE_HOST, PORT))  
P="GET /"+"A"*2000   
s.send(P)  
s.close()  
  
print("Trojan-Proxy.Win32.Daemonize.i / Remote Denial of Service")  
print("MD5: 61bec9f22a5955e076e0d5ddf6232f3f")  
print("By Malvuln");  
  
if __name__=="__main__":  
doit()  
  
  
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